Are offshore credit cards illegal?

Americans can do business in any country as long as such business is allowed by that country.  Therefore, having an offshore credit card is not illegal.  However, most of these cards are designed to evade income tax and that is illegal.  Recently I attended a lecture by a high ranking IRS attorney.  He told us that the IRS is rapidly increasing enforcement efforts against tax evasion schemes.  One of the top schemes they are pursuing at this time is offshore credit cards.  They have obtained the records of many of these offshore banks that issue the cards and are tracing the card holders to see if they have reported the income associated with the cards.  If you have used the card and reported the income used to fund the card, you are in no trouble and what you have done is not illegal.  However, if you have not reported that income, it is tax evasion.  An example is if you earn money overseas and have the funds assigned to the card.  If this is the case, you need to come in to see me immediately, so we can be proactive in addressing the problem.  I have had several clients recently with this same problem and have managed to keep them in the civil collection division of the IRS rather than the criminal investigation division.